Detroit Diesel 60 Series Operator's Manual page 21

Cruise Control
Figure 7. Typical Cruise Control Switches
The DDEC engine may have cruise con-
trol. Cruise control maintains a set vehi-
cle or engine speed setting. The driver
has switches to set, activate, and deac-
tivate the system. See Figure 7. A slight
depression of the brake or clutch pedal
deactivates the system as well. The min-
imum speed at which cruise control can
be used is programmable.
The cruise control may also be pro-
grammed to permit fast idle using the
cruise control switches. With the engine
at normal idle, transmission in neutral
and service brake on, turn on the cruise
control "On/Off" switch, and use the
"Resume" switch. The engine rpm
should increase to a pre-defined rpm.
The rpm can be raised or lowered from
this point using the "set" and "resume"
switches.
The cruise control option will main-
tain the set speed under normal road
and load conditions. It cannot limit vehi-
cle speeds on down grades if available
engine braking effort is exceeded, nor
can it maintain speed on upgrades if
power requirements exceed engine
power capability.
When the cruise enable switch is in
the on position cruise control is engaged
by momentarily
"Set/Coast" switch to the on position.
Holding the switch in the on position
allows the vehicle to slow to a lower
speed. Toggling this switch will result in
a one mile-per-hour (1 mph) decrease in
vehicle speed. If cruise control has been
disabled, toggling the "Resume/Accel"
switch restores the vehicle to the previ-
ously set cruise speed. Holding the
"Resume/Accel" switch in the on posi-
tion allows the vehicle speed to
increase. Toggling this switch will result
in a one mile-per-hour (1 mph) increase
in vehicle speed.
Using either the brake or the clutch
will disable cruise control.
NOTICE:
When descending a hill with cruise
control "off," do not allow the engine
to exceed 2,500 rpm under any con-
ditions. Failure to observe this precau-
tion can result in overspeeding and
serious engine damage.
CAUTION:
To avoid injury from the loss of
vehicle control, do not use cruise
control under these conditions:
When it is not possible to keep
the vehicle at a constant speed
(on winding roads, in heavy traf-
fic, in traffic that varies in speed,
etc.).
On slippery roads (wet pave-
ment, ice- or snow-covered
roads, loose gravel, etc.).
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contacting the